Preparation of SnO2 Thin Film Nanostructure for CO Gas Sensor Using Ultrasonic Spray Pyrolysis and Chemical Bath Deposition Technique
B. Yuliartoa,b, G. Gumilara, D.W. Zulhendria, Nugrahaa,b and N.L.W. Septiania,b
aAdvanced Functional Materials Laboratory, Engineering Physics Department, Institut Teknologi Bandung, Bandung, Indonesia
bResearch Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Bandung, Indonesia
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In recent years, research of metal oxide semiconductor-based sensors has focused on morphology modification of thin film structures. One of the promising materials that is being developed is SnO2. In this research, nanostructured SnO2 thin film was grown using the ultrasonic spray pyrolysis and chemical bath deposition methods with and without external magnet assistance (0.1 T). As precursor solution of the ultrasonic spray pyrolysis process, the SnCl2·2H2O is dissolved in distilled water, with pH varied by adding 37% HCl solution. The precursor solution for the chemical bath deposition process was SnCl2·2H2O, which is dissolved in urea solution with pH customized by adding the NaOH solution. All resulting nanostructured SnO2 thin film samples were characterized by using X-ray diffraction and scanning electron microscopy techniques. The resulting morphologies of SnO2, prepared by chemical bath deposition, using magnetic field, HMTA framework-assisted chemical bath deposition, and ultrasonic spray pyrolysis are spherical, cubic, and spherical, respectively. The sensor response pattern of nanostructured SnO2 thin films, prepared by all tested methods, to 30 ppm CO, is similar in that the response increases with the increase of working temperature. The SnO2 thin film prepared by ultrasonic spray pyrolysis method shows the greatest sensitivity value of 95.12%, with a response time of 216 seconds and a recovery time of 558 seconds, at working temperature of 300 degrees Celsius.

DOI: 10.12693/APhysPolA.131.534
PACS numbers: 68.43-h